High Quality Content by WIKIPEDIA articles! Heliobatis is an extinct genus of ray in the Myliobatiformes family Dasyatidae. At present the genus contains the single species Heliobatis radians. The genus is known primarily from the Early Eocene, Wasatchian stage, Fossil Lake deposits. Fossil Lake is part of the Green River Formation in southwest Wyoming. Heliobatis is one of only two known rays to have been found in the Green River formation; the other species, Asterotrygon maloneyi, was only recognized and described in 2004. Heliobatis ranges from 8 to 90 centimetres (3.1 to 35 in) in length, with an average of between 30 and 40 centimetres (12 and 16 in). As in modern stingrays the genders are dimorphic, with males possessing claspers. Heliobatis individuals have up to three modified dermal denticles, forming barbed stingers, on their tails, though individuals are often found with less than three. The genus is considered to have been demersal in nature.

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